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Introducing Evolution
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last edited
by gerryc 15 years, 5 months ago
Here are some steps that could be used to introduce Evolution.
Go here to watch a much more entertaining video on this idea.
- Introduce the idea of evolution as a way of explaining the changes in organisms over time.
- Introduce competition for resources.
- Find a lot of one resource (e.g. tooth picks) and scatter them in one area.
- Within a time limit, get students to pick up as many resource as possible.
- Get them to count how many they had.
- For those that got a lot ask them how they did it.
- For those that got a little, ask them why. If the resource was food, what would be the long term consequence if this continued.
- Collect the resource.
- Summarise the idea of competition and the consequences. Relate it to the idea that whilst many offspring are born, not all survive because of competition.
- Introduce variation.
- Compare two students. How are they similar. But how are they different. Ask why this is the case.
- Introduce variations in the organisms looking for the resource (ie toothpicks). Eg - reduced sight, kneeling, one hand. Give each student one variation.
- Then scatter the resource again, and making sure the students act out the variation, they grab as many of the resource as possible. Keep to about a 10 second time limit.
- Ask questions 4 and 5 above again.
- Introduce the idea of the existance of extinct species.
- This could include the ancient megafauna of Australia such as the large killer kangaroo, giant wombat and snake.
- Ask why can we see them now? The Australian environment has changed and they didn't survive the changes. The competition for resources was too fierce. Why did kangaroos, emus and koalas survive?
- You could model the change in environment by changing the way in which you scatter the resource ie on the floor (this would favour the kneeling people) or one side of the classroom.
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Do the same as steps 3-5 above. Again, discuss the results.
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Organisms are selected by the environment, and only those organisms that are best adapted to that environment are going to survive.
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Introduce "survival of the fittest" - careful with this idea. Fittest doesn't necessarily mean better. It just means better adapted to the environment.
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Indicate four different features. The movie uses fins, wings, running feet or nothing. Students must choose a different adaption.
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Throw a dice and choose an environment e.g. water, land, tree,
Introducing Evolution
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